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ash: fix globbing bugs when using glibc glob()

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-10-02 15:17:15 +02:00
parent 37dc08b874
commit 8e2c9cc2fc
3 changed files with 66 additions and 7 deletions
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27
shell/ash.c
View File

@ -7038,24 +7038,39 @@ expandmeta(struct strlist *str /*, int flag*/)
goto nometa;
INT_OFF;
p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP);
/*
* GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
* TODO?: GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
*/
i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
// GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match
// GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?)
//
// glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping:
// if you pass it "file\?", it returns "file\?", not "file?", if no match.
// Which means you need to unescape the string, right? Not so fast:
// if there _is_ a file named "file\?" (with backslash), it is returned
// as "file\?" too (whichever pattern you used to find it, say, "file*").
// You DONT KNOW by looking at the result whether you need to unescape it.
//
// Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?",
// returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file.
// Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match).
// With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly.
// i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob);
// i = glob(p, GLOB_NOMAGIC, NULL, &pglob);
i = glob(p, 0, NULL, &pglob);
//bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-");
if (p != str->text)
free(p);
switch (i) {
case 0:
#if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR
/* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */
if (!(pglob.gl_flags & GLOB_MAGCHAR))
goto nometa2;
#endif
addglob(&pglob);
globfree(&pglob);
INT_ON;
break;
case GLOB_NOMATCH:
nometa2:
//nometa2:
globfree(&pglob);
INT_ON;
nometa:

19
shell/ash_test/ash-glob/glob_dir.right Normal file
View File

@ -0,0 +1,19 @@
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
dirtest/z.tmp
*/z.tmp
*/z.*
*/?.*
*/z*p
d*r*e*t/z*p
*\/z.tmp
*/z.*
*/z*p
d*r*e*t/z*p

25
shell/ash_test/ash-glob/glob_dir.tests Executable file
View File

@ -0,0 +1,25 @@
mkdir dirtest
>dirtest/z.tmp
echo */z.tmp
echo */z.*
echo */?.*
echo */z*p
echo d*r*e*t/z*p
echo *"/z.t"mp
echo */z"."*
echo *"/z"*"p"
echo "d"*r*e*t"/"z*p
echo
echo \*/z.tmp
echo "*"/z.*
echo */"?".*
echo */z"*p"
echo d*r*e\*t/z*p
echo *"\\/z.t"mp
echo */z".*"
echo *"/z"\*"p"
echo "d*"r*e*t"/"z*p
rm dirtest/z.tmp
rmdir dirtest